If you know anything about how to earn money with ebook,please tell me?

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Hello everyone.I know that there are palces you can get those ebooks in which the copy right has expired and that means everyone can use them,and even sell them.I don't know where to get those thing online,if you know it,please let me know?On the other hand,Even I get the ebook for free,how can I promote it and sell it with step bu step guild online,please tell me if you know it.There are so many competition online with selling ebook,if you have some great opinion on how to single out the ebook product among the competition group and make some profits out of it,I am humble enough to learn from you.Although some of things you said,I probably maight know it already,but still it is good to be open online.That's always something new in here.Longing for your advice !